An acid and alkali resistant globe valve for a metallurgical system

Abstract

The present invention relates to the technical field of globe valves, and specifically to an acid and alkali resistant globe valve for a metallurgical system. Inside the valve body, channels are respectively provided with a liquid inlet on the left side and a liquid outlet on the right side. The liquid inlet and the liquid outlet are distributed relatively in a lower left and upper right manner. The channels of the two are separated by a valve flap. A fluid cavity is formed below the valve flap in the channel of the valve body. A sealing base communicating with its interior is fixedly arranged at the bottom end of the valve body. A partition is arranged inside the sealing base, and a swirling member is installed on the partition. Rotating the swirling member causes the fluid in the fluid cavity to form a vortex, making the vast majority of metal particles move away from the valve inner wall. A sealing cover is fixedly installed at the bottom end of the sealing base, and a sedimentation chamber closely attached to the inclined surface at the bottom end of the partition is arranged inside the sealing cover, enabling the vast majority of metal particles to fall into the sedimentation chamber, which can prevent the metal particles from corroding the valve inner wall, ensuring the acid and alkali resistance of the valve, and at the same time preventing the valve from leaking.

Description

Technical Field

[0001] The present invention relates to the technical field of globe valves, and specifically to an acid and alkali resistant globe valve for metallurgical systems. Background Art

[0002] A large amount of heavy metal wastewater generated in metallurgical systems needs to be centrally treated before being discharged. This type of wastewater also has a certain degree of corrosiveness. Therefore, the valves used in the wastewater pipelines of metallurgical systems need to have good acid and alkali corrosion resistance. The globe valve is a widely used valve that can be used for fluid cutoff and flow regulation.

[0003] In a patent application with the publication number CN115076408A, a high-strength corrosion-resistant copper valve was proposed. By setting a copper shell, a ceramic lining, and a ceramic valve core, the copper shell serves as the valve body, and the ceramic lining and ceramic valve core serve as the valve working parts, effectively improving the corrosion resistance of the valve. Through the combined two shell bodies and two lining bodies, it is convenient for the installation of the ceramic lining and ceramic valve core, facilitating the processing and assembly of the valve, and improving the structural strength;

[0004] This patent application mainly considered improving the corrosion resistance and installation convenience of the valve, but did not consider that when installed in wastewater pipelines such as metallurgical wastewater pipelines, the metal particles in the wastewater will scour, accumulate, and wear the sealing surface and fluid channels of the valve. After long-term use, it will accelerate the corrosion of the valve body, further reducing the acid and alkali resistance of the valve and even causing leakage of the valve, affecting the service life and use effect of the valve. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides an acid and alkali resistant globe valve for metallurgical systems, which solves the problem that the existing globe valves cannot prevent the corrosion of the valve from being accelerated due to the scouring, accumulation, and wear of the inner wall of the valve by metal particles in the wastewater when installed in wastewater pipelines, and further reduces the acid and alkali resistance of the valve.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: An acid and alkali resistant globe valve for metallurgical systems, including a globe valve composed of a valve body, a sealing top seat located at the top of the valve body, a valve stem vertically penetrating the sealing top seat and the valve body, and a valve flap fixedly connected to the bottom end of the valve stem. The internal channel of the valve body is respectively provided with a liquid inlet on the left side and a liquid outlet on the right side. The liquid inlet and the liquid outlet are distributed relatively in the lower left and upper right positions. The channels of the two are separated by the valve flap. A fluid chamber is formed in the channel of the valve body below the valve flap;

[0009] A sealing base that is fixedly arranged at the bottom end of the valve body and communicates with its interior is provided. A partition is arranged inside the sealing base, and a swirl element is installed on the partition. A number of swirl vanes are movably arranged on the outer circumferential surface of the swirl element to change the flow pattern of the fluid in the fluid chamber.

[0010] A sealing cover is fixedly installed at the bottom end of the sealing base. A sedimentation chamber that closely adheres to the inclined surface at the bottom end of the partition is arranged inside the sealing cover. The sedimentation chamber consists of an upper funnel-shaped part and a lower square-tube-shaped part. The bottom end of the sedimentation chamber extends to the outside bottom end of the sealing cover. A baffle is horizontally penetrated inside the square-tube part of the sedimentation chamber to divide the fluid inside the sedimentation chamber into upper and lower parts.

[0011] Preferably, the cross-section of the sealing base is a cylindrical structure, the cross-section of the partition is a frustum-shaped structure. A round hole is opened at the center position of the upper bottom surface of the partition, and a part of the edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base.

[0012] Preferably, an arc-shaped gap is provided between the other part of the edge of the lower bottom surface of the partition and the inner wall of the sealing base, and the funnel opening of the upper half of the sedimentation chamber completely overlaps with the gap formed between the partition and the inner wall of the sealing base.

[0013] Preferably, a rotating shaft is arranged inside the round hole opened on the upper bottom surface of the partition. A rubber sealing pad is arranged between the rotating shaft and the round hole. The swirl element is fixedly connected to the rotating shaft through a shaft rod, and the swirl element is located inside the fluid chamber.

[0014] Preferably, the other end of the rotating shaft extends below the bottom of the partition. A protective shell is fixedly installed inside the sealing cover. A driving motor is arranged inside the protective shell. The output shaft of the driving motor is bolted to the bottom end of the rotating shaft.

[0015] Preferably, two cylinders arranged back to back are also installed inside the protective shell. The output shafts of the two cylinders movably penetrate to the outside of the protective shell and are both fixedly connected to a push-pull rod. The other ends of the two push-pull rods are respectively fixedly connected to the baffle extending outside the sedimentation chamber.

[0016] Preferably, the two cylinders inside the protective shell are of the same size and the central axes of the output shafts are on the same horizontal line. The left and right push-pull rods are both in the cavity of the sealing cover. The baffle is vertically arranged with respect to the sedimentation chamber. The outer surface of the baffle is wrapped with a sealing rubber layer and is hermetically and movably connected to the side wall of the sedimentation chamber.

[0017] Preferably, the two cylinders are connected in series through the same wire, and the driving motor is connected through another wire. The wires connected to the cylinders and the driving motor both extend outside the protective shell and the sealing cover and are externally connected to two power sources.

[0018] Preferably, a plurality of mounting grooves equal in distance are formed on the outer circumferential surface of the swirl member, and the number of the mounting grooves is the same as that of the swirl vanes. An installation rod penetrates through the inner part of one side edge of each swirl vane, and both ends of the installation rod are fixedly connected to the inner wall of the mounting groove. The axial direction of the installation rod is consistent with the axial direction of the swirl member.

[0019] Preferably, the thickness of the swirl vane is smaller than that of the mounting groove. The other side edge of the swirl vane is close to the inner wall of the sealing base. The maximum diameter of the circle formed by a plurality of swirl vanes is smaller than the inner diameter of the sealing base.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides an acid and alkali resistant globe valve for a metallurgical system, having the following beneficial effects:

[0022] By arranging a swirl member in the sealing base at the bottom of the valve, when draining water, when driving the swirl member to rotate and a plurality of swirl vanes on its outer circumferential surface to rotate simultaneously, a vortex is formed in the fluid cavity, and metal particles are continuously gathered towards the center of the vortex, further making most metal particles away from the inner wall of the valve, avoiding the adhesion of metal particles to the inner wall of the valve and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself;

[0023] By arranging a sedimentation chamber in the sealing base at the bottom of the valve, when no draining operation is carried out, most metal particles will sink to the bottom of the channel of the valve. A part of the metal in the fluid cavity sinks to the upper surface of the swirl member, and the other part gradually falls along the inclined surface of the partition plate into the sedimentation chamber below, so that most metal particles will not adhere to the inner wall of the valve, thereby avoiding the adhesion and corrosion of metal particles to the inner wall of the valve, preventing the valve from leaking, and prolonging the service life of the valve;

[0024] By starting the cylinder to control the block to perform a rapid reciprocating displacement in the horizontal direction, the movement of the block causes the sedimentation chamber to be briefly opened. At this time, the metal particles accumulated above the block are quickly discharged downward, and then the channel of the sedimentation chamber is immediately closed, making the valve re-sealed, so as to achieve the effect of cleaning the metal particles accumulated inside the valve and avoiding the corrosion of the inner wall of the valve, which affects its acid and alkali resistance. Description of the drawings

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0026] Figure 1 is the external shape view of the globe valve body of the present invention;

[0027] Figure 2 is the front view of the globe valve of the present invention;

[0028] Figure 3 Front view of the internal structure of the globe valve sealing base and the sealing cover of the present invention;

[0029] Figure 4 Cross-sectional view of a partial internal structure of the valve body of the present invention;

[0030] Figure 5 Side view of the globe valve of the present invention;

[0031] Figure 6 Schematic diagram of the structure inside the sealing base of the present invention;

[0032] Figure 7 Front cross-sectional view of a partial internal structure of the valve body of the globe valve of the present invention;

[0033] Figure 8 Exploded view of the structure of the swirl element located inside the sealing base of the present invention;

[0034] Figure 9 Top view of the swirl element of the present invention;

[0035] Figure 10 Exploded view of the swirl element, the sealing base and the partition of the present invention.

[0036] Explanation of reference numerals:

[0037] 1. Valve body; 11. Sealing top seat; 111. Valve stem; 112. Valve flap; 12. Liquid inlet; 13. Liquid outlet; 14. Fluid chamber; 2. Sealing base; 21. Partition; 22. Swirl element; 221. Swirl blade; 222. Installation groove; 223. Installation rod; 23. Protective shell; 3. Sealing cover; 31. Precipitation chamber; 32. Stopper; 33. Push-pull rod. Detailed implementation manners

[0038] The following will elaborate on the implementation manners of the present application in conjunction with the drawings and embodiments, so as to fully understand how the present application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0039] Embodiment 1, as Figures 1-10 shown, the present invention provides the following technical solution: An acid and alkali resistant globe valve for a metallurgical system, comprising a globe valve composed of a valve body 1, a sealing top seat 11 located at the top of the valve body 1, a valve stem 111 vertically penetrating the sealing top seat 11 and the valve body 1, and a valve flap 112 fixedly connected to the bottom end of the valve stem 111. The internal passage of the valve body 1 is respectively provided with a liquid inlet 12 on the left side and a liquid outlet 13 on the right side, as Figure 7As shown, the liquid inlet 12 and the liquid outlet 13 are distributed relatively in the lower left and upper right, so that the entering fluid flows in a trajectory of low inlet and high outlet. The channels of the two are separated by the valve flap 112. A fluid chamber 14 is formed below the valve flap 112 in the channel of the valve body 1. When the globe valve is installed in the waste water pipeline of the metallurgical system, the left side of the valve body 1 is set as the fluid inlet, and the right side is set as the fluid outlet, that is, the fluid flows into the fluid chamber 14 along the liquid inlet 12 and then flows out from the liquid outlet 13. A rotary handle is provided at the top of the valve stem 111. By adjusting the rotary handle, the valve flap 112 can be lifted and pressed down to achieve the function of connecting and closing the channel between the liquid inlet 12 and the liquid outlet 13;

[0040] Furthermore, a sealing base 2 that communicates with its interior is fixedly provided at the bottom end of the valve body 1. A partition 21 is provided inside the sealing base 2. A swirl element 22 is installed on the partition 21. A number of swirl vanes 221 are movably provided on the outer circumferential surface of the swirl element 22 for changing the flow pattern of the fluid in the fluid chamber 14, such as Figure 8 and Figure 9 As shown, a number of mounting grooves 222 equal in number to the swirl vanes 221 are equidistantly formed on the outer circumferential surface of the swirl element 22. An installation rod 223 penetrates through the inner part of one side edge of each swirl vane 221. Both ends of the installation rod 223 are fixedly connected to the inner wall of the mounting groove 222. The axial direction of the installation rod 223 is the same as the axial direction of the swirl element 22. When the swirl element 22 and a number of swirl vanes 221 on its outer circumferential surface rotate simultaneously, an eddy current is formed in the fluid in the fluid chamber 14, continuously gathering the metal particles towards the center of the eddy current, further making most of the metal particles away from the valve inner wall, avoiding the valve inner wall from adhering to metal particles and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself;

[0041] Among them, the thickness of the swirl vane 221 is less than the thickness of the mounting groove 222. The other side edge of the swirl vane 221 is close to the inner wall of the sealing base 2. Therefore, during the rotation of a number of swirl vanes 221, the fluid at the inner wall of the sealing base 2 can be quickly driven to flow, thereby avoiding a large number of metal particles from adhering to the inner wall of the sealing base 2. The maximum diameter of the circle formed by a number of swirl vanes 221 is less than the inner diameter of the sealing base 2. When the swirl element 22 rotates, a number of swirl vanes 221 provided at its edge position rotate accordingly. When the rotation speed of the swirl element 22 is the maximum, the maximum diameter of the circle formed by the edges of a number of swirl vanes 221 is still less than the inner diameter of the sealing base 2, which can avoid friction with the inner wall of the sealing base 2 and wearing the valve. Since the thickness of the swirl vane 221 is less than the thickness of the mounting groove 222, at different rotation speeds, such as the rotation speed at the start and stop is different from that in the middle of rotation, the angles of the swirl vanes 221 inside the mounting groove 222 are inconsistent, which can avoid the metal particles in the waste water from adhering to 211 and inside the mounting groove 222 for a long time;

[0042] Furthermore, a rotating shaft is arranged in the circular hole opened on the bottom surface of the partition 21, and a rubber sealing gasket is arranged between the rotating shaft and the circular hole. The swirl member 22 is fixedly connected to the rotating shaft through an axle rod, and the swirl member 22 is located in the fluid chamber 14. The other end of the rotating shaft extends to the bottom of the partition 21. A protective shell 23 is fixedly installed inside the sealing cover 3. A driving motor is arranged inside the protective shell 23. The output shaft of the driving motor is connected to the bottom end of the rotating shaft through bolts. The rotation of the swirl member 22 is driven by the driving motor. The lower part of the partition 21 is completely separated from the upper part thereof. Therefore, the waste water inside the fluid chamber 14 will not flow to the protective shell 23, thereby ensuring the airtightness of the valve.

[0043] Embodiment 2, as Figures 3-10 As shown, a sealing cover 3 is fixedly installed at the bottom end of the sealing base 2, and a sedimentation bin 31 is arranged inside the sealing cover 3, which is close to the inclined surface of the bottom end of the partition 21. The sedimentation bin 31 consists of a funnel-shaped upper part and a square tube-shaped lower part. The bottom end of the sedimentation bin 31 extends to the outer bottom end of the sealing cover 3. A stopper 32 is horizontally penetrated inside the square tube part of the sedimentation bin 31, which is used to separate the fluid inside the sedimentation bin 31 from top to bottom. The cross section of the sealing base 2 is a cylindrical structure, and the cross section of the partition 21 is a truncated cone structure. A circular hole is opened at the center of the upper bottom surface of the partition 21, and a part of the edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base 2. An arc-shaped gap is arranged between the edge of the other part of the lower bottom surface of the partition 21 and the inner wall of the sealing base 2. The funnel opening of the upper part of the sedimentation bin 31 completely overlaps with the gap formed between the partition 21 and the inner wall of the sealing base 2. The gap between the partition 21 and the sealing base 2 is much larger than the connecting part, which helps most of the metal particles sink into the sedimentation bin 31.

[0044] When the fluid in the fluid chamber 14 is stationary, since the density of most metals in the wastewater is greater than the density of water, most of the metal particles will sink to the bottom of the valve channel. Figure 3 and Figure 7 It can be seen that part of the metal in the fluid cavity 14 sinks to the upper surface of the swirl member 22, and the other part sinks to the inclined surface of the partition 21 along the gap between the swirl member 22 and the sealing base 2. The metal particles gradually fall along the inclined surface of the partition 21 to the top funnel of the sedimentation bin 31 below, and the metal particles are finally accumulated above the stopper 32, so that most of the metal particles will not adhere to the inner wall of the valve, thereby preventing the metal particles from adhering to the inner wall of the valve and corroding the valve, preventing the valve from leaking, and extending the service life of the valve.

[0045] Further, two cylinders are installed inside the protective shell 23 and are arranged back to back. The output shafts of the two cylinders movably penetrate to the outside of the protective shell 23 and are both fixedly connected with a push-pull rod 33. The other ends of the two push-pull rods 33 are respectively fixedly connected with a stop block 32 extending outside the sedimentation chamber 31. The two cylinders inside the protective shell 23 are of the same size and the central axes of the output shafts are on the same horizontal line. The left and right push-pull rods 33 are both located in the cavity of the sealing cover 3. The stop block 32 is vertically arranged with the sedimentation chamber 31. The outer surface of the stop block 32 is wrapped with a sealing rubber layer and is hermetically and movably connected with the side wall of the sedimentation chamber 31. After the valve is closed for a certain period of time, by starting the cylinders, the stop block 32 is controlled to perform a reciprocating displacement in the horizontal direction. The rapid reciprocating displacement of the stop block 32 causes the sedimentation chamber 31 to be briefly opened, and the opening time is limited within 1 s. At this time, the metal particles accumulated above the stop block 32 quickly drain downward, and then the channel of the sedimentation chamber 31 is immediately closed, and the valve is resealed, so as to achieve the effect of cleaning the metal particles accumulated inside the valve, avoiding the corrosion of the inner wall of the valve and affecting its acid and alkali resistance. The metal particles and a part of the waste water discharged from the bottom end of the sedimentation chamber 31 are collected through pipes or containers, which is convenient for subsequent treatment;

[0046] Among them, the two cylinders are connected in series through the same wire, and the driving motor is connected through another wire. The wires connected to the cylinders and the driving motor both extend outside the protective shell 23 and the sealing cover 3 and are externally connected to two power supplies. The opening and closing of the driving motor and the two cylinders can be controlled by respectively opening and closing these two power supplies, or timers can be installed on these two power supplies respectively for automatic opening and closing, making the control of the valve more automated.

[0047] When the above-mentioned embodiment works, when discharging waste water, the rotary handle arranged at the top end of the valve flap 112 can be rotated to lift the valve flap 112. At this time, the channel between the liquid inlet 12 and the liquid outlet 13 is communicated, and the waste water can be discharged outward. At the same time, the driving motor located inside the protective shell 23 is started. When the driving motor drives the swirl member 22 and several swirl vanes 221 on its outer circumferential surface to rotate simultaneously, a vortex is formed in the fluid cavity 14, and the metal particles are continuously gathered towards the center of the vortex, further making most of the metal particles away from the inner wall of the valve, avoiding the adhesion of metal particles to the inner wall of the valve and accelerating corrosion, thereby ensuring the acid and alkali resistance of the valve itself;

[0048] When wastewater is not discharged, the fluid in the fluid chamber 14 is static. Since the density of most metals in the wastewater is greater than that of water, most of the metal particles will sink to the bottom of the valve channel. Part of the metal in the fluid chamber 14 sinks to the upper surface of the swirl member 22, and the other part sinks along the gap between the swirl member 22 and the sealing base 2 to the inclined surface of the partition 21. The metal particles gradually fall along the inclined surface of the partition 21 to the top funnel of the sedimentation bin 31 below, and the metal particles are finally accumulated above the stopper 32, so that most of the metal particles are trapped in the fluid chamber 14. Some metal particles will not adhere to the inner wall of the valve, thereby preventing the metal particles from sticking to and corroding the inner wall of the valve, and preventing the valve from leaking. By starting the cylinder to control the block 32 to move back and forth in the horizontal direction, the block 32 moves back and forth quickly to open the sedimentation bin 31 for a short time. At this time, the metal particles accumulated above the block 32 are quickly discharged downward, and then the channel of the sedimentation bin 31 is immediately closed to reseal the valve, thereby achieving the effect of cleaning the metal particles accumulated inside the valve and preventing the inner wall of the valve from being corroded and affecting its acid and alkali resistance.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acid- and alkali-resistant stop valve for a metallurgical system, comprising a valve body (1), a sealing top seat (11) located at the top of the valve body (1), a valve stem (111) vertically penetrating the sealing top seat (11) and the valve body (1), and a valve disc (112) fixedly connected to the bottom end of the valve stem (111), characterized in that: The internal channel of the valve body (1) is provided with a liquid inlet (12) located on the left side and a liquid outlet (13) located on the right side, respectively. The liquid inlet (12) and the liquid outlet (13) are relatively distributed at the lower left and the upper right, and the channels of the two are separated by a valve flap (112). A fluid cavity (14) is formed in the channel of the valve body (1) below the valve flap (112); A sealing base (2) communicating with the interior of the valve body (1) is fixedly disposed at the bottom end thereof, a partition (21) is disposed inside the sealing base (2), a swirl member (22) is mounted on the partition (21), and a plurality of swirl blades (221) are movably disposed on the outer circumferential surface of the swirl member (22) for changing the flow pattern of the fluid in the fluid chamber (14); A sealing cover (3) is fixedly mounted on the bottom end of the sealing base (2). A sedimentation bin (31) is provided inside the sealing cover (3) and is closely attached to the inclined surface of the bottom end of the partition (21). The sedimentation bin (31) consists of a funnel-shaped upper part and a square tube-shaped lower part. The bottom end of the sedimentation bin (31) extends to the bottom end of the outside of the sealing cover (3). A stopper (32) is horizontally penetrated inside the square tube part of the sedimentation bin (31) for separating the fluid inside the sedimentation bin (31) from top to bottom.

2. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: The cross section of the sealing base (2) is a cylindrical structure, the cross section of the partition (21) is a truncated cone structure, a circular hole is provided at the center of the upper bottom surface of the partition (21), and a portion of the edge of the lower bottom surface is fixedly connected to the inner wall of the sealing base (2).

3. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: An arc-shaped gap is provided between the edge of another portion of the lower bottom surface of the partition (21) and the inner wall of the sealing base (2), and the funnel opening of the upper half of the sedimentation bin (31) completely overlaps with the gap formed between the partition (21) and the inner wall of the sealing base (2).

4. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 3, characterized in that: A rotating shaft is arranged in the circular hole opened in the bottom surface of the partition plate (21), a rubber sealing gasket is arranged between the rotating shaft and the circular hole, the swirl element (22) is fixedly connected to the rotating shaft via a shaft, and the swirl element (22) is located in the fluid chamber (14).

5. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 4, characterized in that: The other end of the rotating shaft extends to below the bottom of the partition (21), and a protective shell (23) is fixedly installed inside the sealing cover (3). A driving motor is arranged inside the protective shell (23), and the output shaft of the driving motor is connected to the bottom end of the rotating shaft by bolts.

6. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 5, characterized in that: Two cylinders arranged in back-to-back orientation are also installed inside the protective shell (23). The output shafts of the two cylinders are movably extended to the outside of the protective shell (23) and are fixedly connected to a push-pull rod (33). The other ends of the two push-pull rods (33) are respectively fixedly connected to a stopper (32) extending to the outside of the sedimentation bin (31).

7. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 6, characterized in that: The two cylinders inside the protective shell (23) are of the same size and the central axes of the output shafts are located on the same horizontal line. The left and right push-pull rods (33) are both located in the cavity of the sealing cover (3). The stopper (32) is vertically arranged between the sedimentation bin (31). The outer surface of the stopper (32) is wrapped with a sealing rubber layer and is sealed and movably connected to the side wall of the sedimentation bin (31).

8. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 6, characterized in that: The two cylinders are connected in series via the same wire, and the drive motor is connected via another wire. The wires connecting the cylinders and the drive motor extend to the outside of the protective shell (23) and the sealing cover (3) and are externally connected to two power supplies.

9. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 1, characterized in that: The outer cylindrical surface of the swirl member (22) is provided with a plurality of mounting grooves (222) at equal intervals, the same number as the number of the swirl blades (221); a mounting rod (223) penetrates the interior of one side edge of each swirl blade (221); both ends of the mounting rod (223) are fixedly connected to the inner wall of the mounting groove (222); the axial direction of the mounting rod (223) is consistent with the axial direction of the swirl member (22).

10. The acid- and alkali-resistant stop valve for a metallurgical system according to claim 9, characterized in that: The thickness of the swirl blade (221) is smaller than the thickness of the mounting groove (222); the other side edge of the swirl blade (221) is close to the inner wall of the sealing base (2); and the maximum diameter of the circle formed by the plurality of swirl blades (221) is smaller than the inner diameter of the sealing base (2).

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